Grinder.



E. PRESTON.

GRINDER.

APPLICATION FILED APR. I9, I9I- 1. m m M 4 J www ,I w W .wm m 2 O 1W nlm *II 3 l 4 au d 7 |II|I|||II|I| MW d J J J M I I I I I I I I I I I I I I I I I II I I I I I I I I I I I I I I I I III J/ I".I\|IIIII IIIIIIlIIIlIIIII I Ilfm IIM I l I fu l A i A 7 Z Tk e f I Z 476 .I I2, L Ml f 4I @7 a w IV IIa/MIW I .f Mxi w m Y L 6 @zo w a Z U Mfg 4 1 5 9, ,a4 a@ af d y W :J: 1f 6 @in w .2, @y f4. M 1 w UNITED STATES PATENT oEEIcE. l

EDWARD PRESTON, 0F SEDALIA, MISSOURI, ASSIGNOR, BY DIRECT AND MESNE ASSIGN- MENTS, OF ONE-FOURTH TO JAMES T. MONTGOMERY, ONE-FOURTH T0 JOSEPH CHASNOFF, ONE-TWELFTH TO WILLIAM MINDELL, AND ONE-SIXTH T0 ('IIIZIAUDEl WILKERSON, ALL OF SEDALIA, MISSOURI.

GEINDERk Application led April19, 1917. Serial No. 163,208. i

To all whom t may concern:

Be itknown that I, EDWARD PRESTON, a

`citizen of the United States, residing at Sedalia, in the county of Pettis and State.

grinding the interior of a cylinder of the kind which constitutes a part of an internal combustion engine.

The invention aims to provide novel means whereby axial rotation may be imparted to a grinding Wheel, novel means being provided whereby the grinding wheel may be' caused to move in an orbit.

Another object of the invention is to provide novel means whereby the eccentricity of the grinding wheel, that is, the radius of the orbit in which the grinding wheel moves, may be adjusted.

Another object of the invention is to provide novel means whereby the grinding member will be given a reciprocating movement longitudinally of the cylinder which is being ground, novel means being provided for reversing the movement of the grinding wheel at the ends of the stroke thereof.

The invention aims, further, to improve the various mechanisms whereby motion is imparted to the several parts of the device.

It is within the province of the disclosure l to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of theinvention.

In the accompanying drawings Figure 1 shows in side elevation, a grinding machine consti-noted in accordance with the present invention. parts being broken away;

Fig. 2 is a section taken approximately on the line 2--2 of Fig. 1;

Fig. 3 is a cross section taken on the line 3-3 of Fig. 1;

Fig. 4 is a cross section taken on the line 4 4 of Fig. 1;

Fig. 5 is a fragmental vertical section, showing the means whereby a reversal in the direction of rotation of one of the shafts of the device is brought about;

Fig. 6 is a section on the line 6-6 of Fig. 5, distant parts being omitted, and por.- tions ybeing broken away.

The numeral 1 denotes a support, inthe form of a pedestal, mounted on a foot'plate 2. A bracket 3 projects from the pedestal 1, and the pedestal carries an upper arm 4 and a lower arm 5, the latter being provided with a vertical tubular bearing 6. The pedestal 1 is supplied with bearings Aand with bearings 8.` A cap plate 9 is mounted on the upper end of the pedestal 1, and cap plates 10 are superposed on the cap plate 9.

The numeral 11 marks a horizontally disposed gear wheel supported for rotation on the upper end of the bearing 6. The gear wheel 11 has a vneck 12 mounted to rotate in a recess in the upper end of the bearing 6.

The invention comprises a tubular main shaft 14 which is mounted to move longitudinally andffto rotate in the bearing 6. The shaft 14 vmoves longitudinally inthe gear wheel 11, but is splined as shown at 15 to the gear wheel, so that when the gear wheel is rotated, the shaft 14 will be rotated also. A plug bearing 16 is threaded into the upper .end of the tubular main shaft 14, or is otherdisk 21 abuts against the lower end of the support 18, and is provided with a neck22. A disk 23 abuts aga-inst the upper end of the support 18. A clamp screw 24 passes through the disk 21 and through the bearing 20 and is threaded into the disk 23.

A shaft 25 is mounted to rotate in the disk 21 and its neck 22, in the bearing 20 and in the disk 23. The shaft 25 has a hub 26 coacting with the loWer end of the neck 22. A grinding wheel 27 on the shaft 25 abuts against the hub 26 and is held in place by a nut 28 threaded. onto the lower end of the shaft 25. A collar 29 surrounds the shaft 25 above the disk 23 and is secured to the shaft as shown at 30. By loosening the clamp screw`24, the grip of the disks 23 and 21 on the respective ends of the support 18 may be loosened, and then the bearing 20 may be rotated in the support 18. Since the shaft 25 is mounted eccentrically in the bear- -ing 18, a lateral adjustment of the Wheel 27 with respect to the Work may be obtained by rotating the bearing `20 as aforesaid.

Y When the screw 24 is tightened up, the disks 23 and21 will bind on the ends of the support 18, and thus the shaft 25 and consequently the grindingwheel 27 will be held in adjusted lateral positions with respect to the work. Since the shaft 25 is eccentrically mounted, not only withrespect to the bearing 20, but with respect to the support 18 as Well, it will be obvious that when the main tubular shaft 14 is rotated by means of the gear wheel 11, the grinding Wheel 27 will move in an orbit, the periphery of the grinding wheel coperating with the inner surface of the cylinder which is to be ground. 'v A The lower end of a flexible shaft 31 is attached to the collar'29, and when the exible shaft 31 is rotated, rotation will be imparted to the shaft 25 and the grinding Wheel 27. Since the shaft 31 is flexible, it is possible to shift the shaft 25, in the manner ereinbefore described, laterally, with respect to the axis of rotation of the main tubular shaft 14. Oil may be introduced into the tubular'shaft 14 when the screw 17 is removed fronrtlie plug bearing 16, the flexible shaft 31 being thoroughly and adequately lubricated, since it operates within a container (the tubular shaft 14) which is filled wholly or in part with oil. The upper end ofthe iiexible shaft 31 is secured to a collar 32, as indicated at 100. The collar 32 coperates with the lower end of the plug bearing 16 and is secured as shown at 33 to a shaft 34 journaled for rotation in the plug bearing 16. The shaft 34 rotates in a 4aterally extended arm 35 engagin the upper end of the plug bearing 16.v `e shaft 34 has an abutment 37, and a Washer 36 is interposed between the abutment 37 and the arm 35. Through the coperation of the parts above described, the shaft 34 is held for rotation, but against longitudinal movement, on the upper end of the tubu-A lar main shaft 14.

shaftv 34 passes through the pulley 38 and its neck 39, and is splined to these parts, as shown at 41. When the pulley 38 is rotated, rotation is imparted to the shaft 34, and rotatory movement is transmitted to the shaft 25 and to the grinding Wheel 27 by means of the iexible shaft 31. The tubular main shaft 14 can slide longitudinally in the gear Wheel l1, but is splined thereto as indicated at 15, so that the parts 11 and 14 rotate together, the part 11 constituting means for rotating the shaft 14 and, further, the shaft 34 can slide longitudinally in the pulley 38 and in its neck 39, the spline 41 permitting rotary movement to be imparted to the shaft 34, as aforesaid. The pulley 38 is driven by a belt 42 trained across sheaves 43 carried by the rear end of the cap plates 9 and 10, these members being held on the upper end of the pedestal 1 by means of securing elements 93. The belt 42 is trained around a pulley 44 mounted on a shaft 45. The shaft 45 may be driven in any desired way, but in the present instance, it consti- 51 mounted on the arm 4, the flexible ele ment being connected as indicated at 52 with the arm 35. The weight 48 constitutes a counterpoise, offsetting the Weight of the tubular shaft 14 and other parts hereinbefore described, which move vertically along with the tubular shaft. The numeral 95 indicates any suitable means assembled with the pedestal 1, whereby the pedestal may be held to a supporting structure (not shown) during the grinding operation. It may be desirable to mount the pedestal directly on one of the cylinders of an engine, anot er cylinder of which is to be ground internally by the wheel 27, or it may be convenient to mount the pedestal on an independent supporting structure shown), these details having nothing to do with the general operation of the structure, and meriting no specific delineation. Further. the counter-weight 48 and the flexible element 49 which supports the counter- Weight may be omitted if desired.

A horizontal tubular shaft 53 is journaled A pair of connected pulleys 54 and 55 are (not mounted to rotate on the tubular shaft 53, exteriorly of one of the bearings 8.' A pullcy 56 Iis mounted to rotate on the tubular shaft 53 in spaced relation to the pulley 55. A crossed belt 57l connects the pulley 56 with a pulley 58 mounted on the shaft 45 of the motor 46. A direct beltv 59 connects the pulley 55 with a pulley 60 on the shaft 45 of the motor 46. The tubular`shaft .53 carries a Worm 61 located between the bearings 8. y The worm 61 meshes into a worm wheel 62 carried by a lead screw 63, the upper end of which is journaled as shown at 64 in the arm 4, the lower end of the lead screw 63 being journaled as shown at 65 in a pinion 66 supported on the arm 5 and connected with the upper end of a shaft 67 journaled in the arm 5, the shaft 67 being provided at it lower end with a worm wheel 68. The lead vscrew 63 is threaded into the arm 35, and it will now be obvious that if the lead screw is rotated in one diy rection, the tubular shaft 14 'and parts carried thereby will be raised, whereas if the lead screw 63 is rotated in an oppositeA direction, the shaft 14 and arts carried therel by will be lowered. In t is way, the grinding wheel 27 will have an up and down stroke, longitudinally of the engine cylinder which is being ground internally.

The worm wheel 68 on the lower end of the'shaft 67 meshes into a worm 69 carried by a horizontal shaft 70 journaled in the bearings 7. The shaft 70 is provided at one end with a pulley 71 around which is trained a crossed belt 72 engaged with the pulley 54 which is mounted on the tubular shaft 53.

A rod 73 is mounted to move endwise in the tubular shaft 53, and is adapted to rotate therewith. A rod 74 is disposed parallel to the rod 73 and is mounted to move endwise in the bearings 8. AnV arm 75 is connected with one end of the rod 74, and the rod 73 is mounted to rotate in the arm 75, the rod 73 having collars 96, located on opposite sides of the arm 75. The construction is such that when longitudinal movement is imparted to the rod 74, a longitudinal movement will be imparted to the rod 73, the rod 73 withal being mounted to rotate in the arm 7 5. The rod 73 is provided with a finger 76 located between the pulleys 55 and 56 and movable in a slot 77 formed in the tubular shaft 53. The pulley 55 is provided with a projection 78a and the pulley 56 has a projection 78. When the rod 73 is moved endwise, the linger 76, coperating with the projection 78, couples up the pulleys 54 and 55 with the shaft 53, and when the finger 76 coacts with the projection 78 on the pulley 56, that `pulley is coupled up with the shaft 53, the pulleys 54 and 55 being rotatable on the shaft 53.

The tubular main shaft 14 is rotated continuously by a gear train comprising the the belt 72, the pulley 54, the pulley 55, the

belt 59, the pulley 60 and the shaft 45 of the motor 46. If-the rod 73 be md'ved to the left (Fig. 5), then the finger 76 on the rod 73, coacting with the projection 7 8n on the pulley 55,.will couple the pulleys 55 and`54 to tlleshaft 53, so that the shaft 53 and consequently the worm 61 will be rotated in one direction by the instrumentality of the belt 59. If, however, the rod 73 is moved to the right (Fig. 5), then the finger 76 coacting with the`projection 78 on the pulle 56 will couple up the pulley 56 with the shaft 53, and the shaft 53 together with the worm 61 will be rotated in a reverse direction, because the belt 57 is crossed. When the parts are arranged as above described, the pulleys 55 and 54 will continue to rotate upon the shaft 53, independently 4of the rotation imparted to the shaft 53 from the pulley 56. The construction is such that whether the shaft 53 and the worm 61 be rotated in a direct or in a reverse manner, a continuous rotation in one direction will be imparted to the main tubular shaft 14 by way of the gear wheel 11, the pinion 66, the shaft'67, the worm wheel 68, the worm 69, the shaft 70, the belt 72, the pulley 54, the pulley 55, the belt 59, the pulley 60 and the shaft 45 of the motor.

It has been pointed out hereinbefore that a direct and a reverse rotation may be imparted to the worm 61, motion being imparted from the worm 61 to the le'ad screw 63, by means of the worm wheel 62. 'When the lead screw 63 is rotated in one direction, the tubular main shaft 14 and parts carried thereby will be moved upwardly, and when the lead screw 63 is rotated in an opposite direction, the tubular main shaft 14 and parts carried lthereby will be moved downwardly. The invention comprises means whereby the vertical movement of the tubular main shaft 14 is reversed automatically at the ends of the stroke, and this mechanism will now be described. v

Thev rod 74 shown in Fig. 5 carries a block 79 to which the lower end of a lever 80 is pivoted at 80 (See Fig. 6). The lever 80 is mounted at its upper end to swing on a pivot element 81 carried by the pedestal 1. The numeral 82 denotes an angle member mounted to swing for adjustment on the pivot element 81. The angle member 82 includes a depending `arm 83 having an elongated slot 84 through which passes a clamp screw 85 engaging the lever 80. The angle member 82 includes a transverse arm 86 pivoted as shown at 89 to a vertically moving shifting bar 90, the upper end of which is mounted to slide, as indicated y tractile spring 87 is connected at its lower at 94 in the arm 4. By loosening the clamp screw 85, the angle between the lever 80 and the arm 86 may be adjusted. The shifting bar 905s provided with spaced projections 91 lying in the path of the arm 35. The projections 91 may be of any desired form, but in the present instance they are shown in the form of collars held on the bar 90 by means of set screws 92. A reend with the clamp screw 85 and is connected at its upper end, as shown at 88, with the pedestal 1.

`When the arm 35, having been elevated by the action of the lead screw 63, engages the upper' collar 91, the shifting bar 90 is raised, and when the arm 35, having been moved downwardly by the lead screw 63, engages the lower collar'91, then the shifting bar 90 is moved downwardly. theA shifting bar 90 moves vertically, as aforesaid, the angular lever including, broadly speaking, the parts 86 and 80 will be swung to and fro, the spring 87 aiding in securing a prompt movement of the parts mentioned. When the part 80 is swung inl a lateral direction, longitudinal movement will be imparted to the rodv74, longitudinal movement being imparted to the rod 73 by means of the end bar 75, and the finger 76 on the rod 73 being made to coperate with! the projection 7 8a on the pulley 55, or with the projection 78 on the pulley 56.

The operation of the device has been dealt with hereinbefore, in connection with the various component mechanisms, but a rsum of the operation may proitably be given at this point.

When the shaft 45 is rotated, rotation is imparted to the shaft 34 by way of the belt 42. Motion is transmitted from the shaft 34 to the shaft 25 and to the grinding wheel 27 by way of the exible member 31, and the wheel 27 isv driven at a hi speed. The wheel 27 not only has an axial rotation imparted thereto, but it has an .orbital movement as well, since the main tubular shaft 14 is rotated by the gear-wheel 11 and the pinion 66, and since the shaft 25 is eccentrically mounted withrespect Ato the axis of the tubular shaft14 it being ossi'ble to adjust the position of the sha 25 lwith respect to the axis of the shaft 14, by rotating the bearing 20 inthe support` 18, the shaft 25 being held in adjusted lateral positions by tightening up the clamp screw 24.

The .lead screw 63, being threaded into the arm 35, causes a vertical reciprocation of the tubular shaft 14. Whenthe arm 35 arrives at the ends of its vertial stroke, it coacts with the collars 91 and imparts a longitudinal movement to the shifting bar 90, the latter actuating th'e angle lever 86-80 and imparting an endwise movement to the rod 74, endwise movement being wheel 62 to drive the lead screw 63 in one` direction or in an opposite direction.

It is to be observed that although the axial rotation imparted to the grinding wheel 27 is rapid, the orbital movement imparted to the wheel 27, and derived from the tubular main shaft 14, the gear wheel 11, the pinion 66, the shaft 67, the worm vilrheel 68, and the worm 69, is comparatively s ow.

Having thus described the invention, what is claimed is 1. In a device of the class described, an outer shaft; an innerv shaft having one of its ends disposed eccentrically of the outer shaft; means'for connecting said shafts for simultaneous longitudinal movement but for independent rotation; a supporting structure; means for mounting the shafts on the supporting structure for rotation and for longitudinal movementya grinding ele- ,ment carried by said end of the inner shaft;

means for rotating the inner shaft; mechanism for imparting longitudinal movement to both shafts; means operating in one direct-ion for rotating the outer shaft; driving means operating in a reverse direction; and shiftable means for selectively coupling the means for rotating the outer shaft, and said driving means, with *said mechanism.

2. In a device of the class described, an outer shaft; ,an inner; shaft; means for mounting the shafts for simultaneous longitudinal movement but for independent rotation; a support on one end of theouter shaft; a bearing eccentrically mounted in the support for rotary adjustment; disks at the ends of the bearing and adapted to be clamped on the ends of the support to hold the 'bearing in adjusted positions, the inner shaft being journaled in the disks and. being journaled eccentrically in the bearing; a clamping device connecting the disks and passingthrough the bearing; .and a grinding wheel carried by the inner shaft and disposed externally of the support. v

3; In a device of the class described, a pedestal; an outer shaft mounted to rotate and to move longitudinally with respect to the tpedestal; an inner shaft within the outer sha and having one of its ends disposed eccentrically with respect to the outer shaft; a grinding element carried by said end of the inner shaft; means for rotating' thegether; a {iexible element; means on the 130 pedestal for supporting the intermediate portion of .the flexible element slidably; means for connecting one end of the flexible element with the shafts; and means for ap- 5 plying tension to the other end of the flexible element whereby the iexible element will aid in supporting the shafts during the longitudinal movement thereof.

EDWARD PRESTON.

Witnesses KENT JOHNSON, WM. WHEELER, 

